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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bellerophontoidea ： ウィキペディア英語版 Bellerophontoidea The Bellerophontoidea, (Bellerophontaceae Ulrich & Schofield, 1897, ex Bellerophontidae McCoy 1951), common name "bellerophonts",〔Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. ''Classification and nomenclator of gastropod families''. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278〕 is a superfamily of extinct planospirally-coiled globose molluscs. This superfamily is generally included within the Gastropoda, but may instead be a group of monoplacophorans. The taxon first appeared late in the Cambrian and continued until late in the Triassic. ==Biology== Unlike normal gastropods, the shells of Bellerophonts are characterised by a completely planispiral pattern of coiling, such as one finds in shelled cephalopods. Experts disagree whether Bellerophontids should be classified as torted gastropods, or as untorted Tergomya, or whether the group Bellerophontida is perhaps an artificial construct, consisting of a number of distinct groups of Palaeozoic molluscs which evolved the same type of spiral shell independently.〔Wagner, P. J. 2001 Gastropod phylogenetics: progress, problems and implications. ''Journal of Paleontology'' 75: 1128 - 1140〕 J.B. Knight, ''et al.''〔J.B. Knight, ''et al.'' 1960. Treatise on Invertebrate Paleontology, Part I, Mollusca 1; R.C. Moore,(ed); Geological Society of America and Univ Kansas Press.〕 (1960) regarded the bellerophontids as torted gastropods even though they have essentially symmetrical, planispiral shells. The narrower apex was probably held to the rear while the wider aperture was oriented to the front where the animal could easily emerge or retreat. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bellerophontoidea」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.